题干
W0rd comes ______free souvenirs will be given to _____comes first.
A：what ; no matter whom
B：that; whoever
C：which; whomever
D：that ; no matter who
答案(点此获取答案解析）
B
的平行单色光照射双缝，在光屏上偏离中心的P点处恰好出现亮条纹，则( )